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"Seth was an amazing person who only cared about trying to help others and make the world better," Aaron Rich, Seth's brother, wrote on the fundraising page. "He was extremely passionate about his civic duty and making sure everyone had a chance to be heard. My brother made a difference every single day, and I know that now more than ever because of the emotional support we have received from across the country and around the world."

The GoFundMe campaign launched on March 19 and has raised more than $10,000 of its $200,000 goal.

"We know somewhere, someone has the information on who murdered Seth," Aaron wrote. "We ask for your help in enabling us to help solve Seth's murder, and find the closure we need to move forward in our grieving of our beloved brother and son."